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1999 Chevy Blazer change in temp out side affecting proform

Tiny
ARGON
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
When the temp outside goes up the car runs better, when it is cold it will backfire, no codes. This all started after the engine was replaced, also the milage went down to 10 miles per gallon, till it warms up out side, it went back up for a short time when I had the front and rear punkins rebuilt. Reviewed all connections for the past year and replaced numerus parts < mass air flow, temp censor, tune up, etc.
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Friday, April 25th, 2008 AT 8:23 AM

3 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Sounds like a temp sensor or something else wasnt plugged in when they did the engine. I would look and see if anything is disconnected under the hood.
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Friday, April 25th, 2008 AT 8:43 AM
Tiny
ARGON
  • MEMBER
  • 2 POSTS
Checked all connections over and over, what in this auto would let outside temp effect the engine so dramaicly?
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Friday, April 25th, 2008 AT 8:56 AM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
(MAT) manifold air temp sensor, coolant temp sensor, O2 sensor if it is reading lean
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Friday, April 25th, 2008 AT 9:49 AM

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